You should be able to figure out how it works if you know that sort turtles turns your turtles agentset into a list and item allows you to get a specific item in a list.

Edit:

Doing create-turtles length coordinates instead of something like create-turtles 4 will ensure that you have the same number of turtles as the number of coordinates you defined, but that's something that may or may not apply to your situation.

Edit 2:

An even simpler approach, that would only work if your turtles are not already created, would be: